Electric-lamp socket.



G. B. THOMAS.

ELECTRIC LAMP SOCKET.

APPLICATION FIVLED JUNE 27,1914.

1 6 1 7 Patented New... 28, 1916.

I m Fig. .11,

3 1mm M00 inn sans arnnr clerics.

GEORGE 1B. THOMAS, OF BRIDG-EJPORT, CONNECTICUT, ASSIGNOB TO THE BRYANTELECTRIC COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF CON-NECTICUT.

ELECTRIC -LAMP SOCKET.

modem.

Application filed June 27, 1914. Serial No. 847,700.

To all whom it 112 (13 concern Be it known that I; Gnonon B. Tnonms,

a citizen of the United States of America, and residing at Bridgeport.in thecounty of Fair-field and State of Connecticut, have invented acertain new and useful Improvement in Electric-Lamp Sockets, of whichthe following is a specification.

My invention relates to electric lamp sockets and particularly tosockets adapted to contain lamps of large candle power, the particularobject of my invention being to provide improved means for securing theinsulating body of the socket within its casing.

In the accompanying-drawings, Figure 1 is a broken elevation of mysocket in which my. invention is embodied in one form: Fig. 2 is a planof the insulating body of the socket Fig. 3 is a plan of the cap portionof the casing; and Fig. 1 is a side elevation of the cap.

In sockets of the present character, the customary method ofinstallation consists in screwing the nipple oi the cap onto thesupporting wire conduit, fastening the wires to the binding screws onthe insulating body of the socket, pushing the latter up within the capin register with short lugs carried by the cap and taking into shallowrecesses in the porcelain body whereupon the socket body is fastened inthe cap and in engagement with thelugs mentioned by means of a set screwpassing through a peripheral flange or skirt at the lower edge of thecap.

The cap and insulating body being thus. secured in position, the lowerportion or shell of the casing is then passed up over the body of thesocket and screwed into the threaded portion of the cap flange, afterwhich the shell is prevented from backing off by means of a set screw.

It has been found in practice that the use of a set screw to hold theinsulating body of the socket up within the cap is unsatisfactory, sincethe pressure of the screw throws the body out of alinement with the axisof the socket and maintains it in this crooked position even after theshell has been screwed into the cap. Consequently when the lamp isscrewed into the socket, it emphasizes this crooked position of thesocket body, since the lamp projects at a more or less marked angle tothe axis of the casing. The present invention obviates this difficulty.In the form here shown, the socket casing comprises the cap 10 carryingat its upper portion the usual threaded bushing 11, with set screw 12,which bears 7 against the wire conduit and prevents the cap fromaccidentally becoming loose after it has been screwed into position. Aperipheral flange 13 at the lower edge of 'the cap is internallythreaded to engage the threaded upper portion of the shell 14; withnwhich the insulating lining 15 is ad- JIIStQCl asusual. lVithin thiscasing-is arranged the insulating body 16 of the receptacle carrying theusual lamp terminals, of

which only the screw shell .17 is here shown.'

The current is led to the lamp terminals as usual. from binding screws18, of which only one is here shown. A. long pin 19 projecting below thelower edge of the cap is rigidly secured thereto at a point within thearea of theinsulating socket body '16 and in the adjusted position ofthe latter enters the recess 20 formed at one edge thereof. The flange21 at the upper edge of the insulating body'lG overlies the inturnedupper edge 22 of the shell and is clamped between the latter and theshoulder 23 of the cap when the shell is screwed up into position. A setscrew 24, carried by the peripheral flange 13 of the cap, engages theupper threaded portion of the shell and prevents the latter from backingoff after it has been screwed into position.

The manner of assembling the parts is readily understood. The cap is asusual screwed onto the pipe conduit which enters the threaded nipple 11and the set screw 12 is then tightened. After the wires have beensecured to the wire terminals 18 on the body of the socket, the shell1st is passed up over the body 16 of the socket until the flange 21 onthe latter rests upon the inturned upper edge 22 of the shell. Inasmuchas the pin 19 projects below the lower edge of the cap flange 13, itreadily positioned in the recess 20 in the socket body and the latter isthus held against swiveling while the shell 14. is screwed home withinthe cap flange 13. The pin 19 serves the second function of properlylocating the body 16 of the socket Within the cap so that the customarywings cut from the cap lining 25 enter the recesses for the bindingscrews 18 and overlie the latter. When the shell has been turned homeand the flange 21 cleinpedbeneeth the shoulder 23 of the cap, the setscrew 24 is then tightened to hold the cap and shell in fixed position.

it do not limit my invention to the precise construction shown, butclaim as my inven- 1. in an incandescent lamp socket, a casingcomprising ev shell and e cap having a screw-threaded sleevingconnection, an insulating socket bodv Within said casing and socket bodyto prevent the latter from turn ing with relation to the cap during theassembly of the shell and cap. v

2. In an incandescent lamp socket, a casing comprising a shell ands caphaving a screw-threaded slee'ving connection, an insulating socket bodyWithin said casing adapted to be carried by' the shell during theassembly of the shell and cap, andnieans carried by the cap and engagingthe socket body in advance of the sleeving of the shell and cap andserving to prevent the rotation of said socket body with relation totlllie cap during said assembly of cap and she v 3. An incandescent lampsocket having a casing compiising a shell and cap detachably connectedtogether in sleeved relation denies oi. this patent may be obtained forfive iliary recess in advance of the lower edge of said cap' and adaptedto enter said recess in the cents each, by addressing the essee? ship,an insulating socket body Within said casing and having lateral recessesfor Wire terminals and an auxiliary recess, an insulating lining in thecap having ears extending into said wire terminal recesses in theassembled condition or" the casing, and means carried by the capandengaging said aux: sleeving of the shell and cap on the assembly ofthe latter, for the purpose described.

4. An incandescent lamp socket, having a casing comprising a shell andcap detachably connected together, an insulating socket body Within saidcasing and having lateral recesses for bindlng-screw terminals and anauxiliary recess, an insulating lining in said cap having portionsentering the Wire terminal recesses in the assembled position. of theparts together with a pin projecting below the lower edge of said capandsdapted to enter said auxiliary recess to properly locate the socketbody with relation to the cap and: its lining, substantially asdescribed.

- in testimony whereof I have/signed my name to this specificatiomin thepresence of two subscribing Witnesses.

GEGRGE B. THOMAS.

Witnesses:

G. V7. Goonnmon,

M. lVICHERT.

"commissioner of Patents Washington, ill. 13.

